Yarn stop motion



May 1, 1928. 1,668,435

G. A. URLAUB YARN STOP MOT-ION Fi led Feb. 4. 1925 IHVENTOR Ge 02: 4 17.Ur'lauz @7113 atwrneys Fig.5. 74 WWW Patented May 1,1928.

PATENT OFFICE.

GEORGE ADAM URLAU B, 0F BAYONNE, NEW JERSEY.

" YARN STOP MOTION.

Application filed February-4, 1925. Serial No. 6,772.

My invention relates to stop .motions for knitting and weaving machinesand more particularly to-such machines adapted to use a plurality ofyarns or threads. One ob- 6 ject of my invention is to provide. aconstruction which will keep reasonably free from accumulation of lintand can be easily cleaned. AnOtherobject is to provide a construction inwhich any of the drops for the arns can readily'be taken out of actionwhi e the others are left in operative position. Another object of myinvention 1s to provide a simple and efiicient stop motion deviceadapted for use where there are a multiplicity of yarns in a smallspace.

In the accompanying drawings I have illustrated my invention applied toa warp knitting machine, but it will be'understood that it is applicableto any knitting, weaving, winding or spinning machine.

In the drawings Fig. 1 is an end elevation of the upper portion of awarp knitting machine with my stop motion attached;

Fig. 2 is a sectional elevation on a larger scale of one unit of mydevice with certain modifications;

Figs. 3 and 4; are elevations of a modified form of drop in theout-of-action and cleanin positions respectively; 1

Iigs. 5 and 6 are-side elevations showing the three tier and single tierarrangements of the drops; while Fl .7 fied orm of tip for the drops. v

.In the type of stop motion to which this invention'relates, eachindividual yarn- (and when I speak of am I includeboth yarn andthread)'-is t readed through its own individual drop which is arrangedto close an electric circuit or actuate some other means. adapted tostop the machine when released by breaking of the yarn.

When my invention is applied to a warp knitting machine there .is a rowof actuating drops 10 for each warp and in the row an individual dropfor each warp end or am 12. The yarns from one or more warp heams 13 canbe threaded to the same row of drops and the drops can, if 'desired, beof,'such lengths as willpermit warps which lie'in'rows near each otherbeing threaded on them. In the drawings I have shown the warp endsassembled in two rows, one on and 8 are detail views'of a modieach sideof the longitudinal center line of the machine and one row of drops foreach warp thus assembled.

I Each drop 10 is preferably in the form of a small fiat bar having anopening 14 at its upper end through which one of the yarns 12 can bethreaded. The opening 14 may be merely a tapered hole as shown in Fig. 3or it may have a glazed porcelain lining 15 as in Figs. 7 and 8, thus atthe same time protecting against wear and insulating the dropl from theyarnelectrostatically. T ese actuating drops are mounted on the frame ofthe machine in the novel manner now to be described. A frame completelyenclosing the drops in each row except for theirupper ends, affords saiddro s free slidingsupport at an angle from t e vertical. In the exampleshownin the drawings this frame is composed of a frame proper 16 and aback plate 17. The frame proper 16 is an inverted U shaped metal stripwith a brace -18 separating the upper part of the inverted U from thelower. The top of the U strip and the brace 18 are slotted to receivethe drops. The frame proper is mounted above but insulated from a metalback plate 17 which plate can be removed.

One of the novel features of my device is the shoulders for putting anyindividual drop out of action, either when the particular yarn on whichit is threaded is not needed .for the time being, or for purposes ofcleaning. For this pur ose I prefer to make these shoulders in the formof two notches in the lower edge of the drop, one near the lower end andone neartheupper end. The notch 20 near the lower end 15 so positionedthat when the drop has a yarn held out of action without necessitatingits entire removal, although it is perfectly feasible to remove anyindividual drop by pulling it upwards entirely out of the frame,

if this is found desirable, or if the individual drop has to be replacedfor any reason.

I have found, however, that when it is desired to clean the machine fromaccumulation of lint etc'., it takes some little time to separately lifteach individual drop to this raised out-of-action position, andtherefore provide another set of out-of-action or cleaning notches 21which normally lie above the top of the frame, by which all the dropscan be put and held out of action together when the yarns are taken outof them. When the yarns are removed and the machine is to be cleaned theback plate 17 is removed in any suitable manner as for instance bysliding it out from under the insulation 25 (Fig. 2). The drops willthen slide down till the notches 21 catch on the frame and hold thedrops. This position is shown in Fig. 4. When in this position, theindividual drops are conveniently located for rethreading new yarnsthrough them.

If it is desired to make use of the backplate as a means of showing allthe drops up to operative position simultaneously, the back plate can befastened to the insulation 25 by a hinge 27 at its lower edge, and swungup into position and held there by latch 26all as shown in Fig. 2. Thenotch 21 is tapered on its lower shoulder to permit this being donewithout handling the. indi-;

vidual drops. When the back plate is mounted in this manner its endswill not extend over the frame of the machine but will lie between theframe. The slots in the frame proper are just deep enough to take thefull depth of the drops, thus preventing the entrance of lint. If-anylint does get through the slot it will be prevented from reaching theback plate by the slotted brace.

In some types of machines the yarns will vibrate and change theirtension somewhat and sometimes tend to jerk the drops upward. Thisjerking might occasionally lift the drops so high that the out-of-actionnotches-20 would fall into engagement with the brace 18 and beinoperative. For the purpose of preventing this accidental jerkmg out ofaction and without hindering intentional removal of the drop from theframe, a shoulder 22 is cut in the under edge of the drop just above theout-of-action notch 20, (see Fig. 2). This shoulder is ta- 'pered towardthe upper end of the drop but provides an abutment which hits againstthe race 18 when the drop is jerked up thus permitting the drop tofallback to normal. If desired this safety shoulder can be combined withthe cleaning notch 21 toform a long notch 23 as shown in Figs. 3 and 4.

It will be observed that in my device the drop can be made of any'flatsheet material and as small and light as desired, thus ensibling anumber of drops to be placed close toget er as shown in Fig. 6. However,in

some knitting and weaving machines, such for instance as the warpknitting machine illustrated in Fig. 1, there are a great many yarnsclose together and in such a construction the drops of a row can beplaced in staggered relation, one above the other in several tiers, asshown in Figs. 1, 2 and 5. By placing these drops in this position it ispossible to control all the yarns which are ever found in one machinewithout in any way increasing the number of elements in the stop motionother than actual drops themselves. In this formation I have shown thedrops of the tiers made of different lengths in order to have them alloperate on yarns in the same row, but if it is desired to have the dropsall of the same size, the yarns can be led past the points of the dropsat right angles thereto or the yarns can be spaced apart in severalrows. However it is essential that the drops themselves be at an anglefrom the vertical in order to permit proper functioning of the notches.

I prefer to employ my stop motion as an electrical device by connectingthe frame proper 16 as one terminal in an electrical circuit 24 and byconnecting the back plate 17 as the other terminal of the circuit. Inthe drawings I have shown the frame 16 and the drops insulated from theframe of the machine bythe insulation 25. The electri-. cal circuit caninclude any suitable means designed to open the circuit, such forinstance as a solenoid 26 adapted to break the power circuit as shown inFig. 1. When a solenoid is used I have found it advisable to have thissolenoid open the stop motion circuit 24 after the power circuit hasbeen opened in order that the current in the stop motion circuit maycease to flow as soon as it has done its work.

When a yarn breaks, the stop motion operates in the usual manner by theparticular I drop sliding down until it contacts with the back plate 17as shown in Fig- 2, thus completing the circuit between the frame 16 ofthe stop motion and the back plate 17, and causing the power to be shutoff. i

For examples of other uses to which my invention can be put I mentionlace attach- Ill ments, full fashioned hosiery machines,

winding andwarping machines, etc. though I do not limit myself to theseapplications.

Many modifications from the example described will occur to thoseskilled in the art without departing from the scope of my invention.

' What I claim is:

1. In a yarn stop motion, a frame in combination with an actuating dropslidingly supported in said frame at an angle from the vertical. saiddrop being adapted to be put and held out of action by engagement withsaid frame.

2. An actuating drop for a yarn stop mo tion, comprising a flatbar'having an open ing at its upper end through which a yarn can bethreaded, and an edge on which the drop is adapted to slide, said edgehaving a shoulder therein adapted to hold said drop outof action,substantially as described.

3. A multiple yarn stop motion having actuating drops each withashoulder thereon, in combination with a frame completely enclosing saiddrops except for the upper ends thereof and holding said drops at anangle from the vertical, the shoulders on the drops being adapted tohold the drops out of action when enga ed with said frame, substantiallyas described.

4. A multiple yarn stop motion having actuating drops each adapted to bethreaded on a yarn at its upper end, and a frame enclosing all of saiddrops except their threaded ends and supporting them inslots at an anglefrom the vertical each drop having a notch adapted to engage the frameand holdthe drop out of action when the latter is lifted above itsnormal operative position, substantially as described.

5. A multiple yarn stop motion having actuating drops mounted at anangle from the vertical, in combination with a frame completelyenclosing said drops except for the upper ends thereof, said drops beingremovable but each having a shoulder adapted to prevent accidentaljerking out ofv action substantially as described.

6. A multiple yarn stop motion having actuating drops each adapted to bethreaded on a yarn at its upper end,in "combination with aframe-supporting said drops at an angle from the vertica1,'eachdrophaving a notch adapted to engagethe frame and hold the dro out of actionwhen the latter is lifted a ove its normal operative position,

said drops being removable but each havfrom operative position, and anelectric circuit having stop means therein and having said frame andback plate as terminals.

8. A multiple yarn stop motion having a frame and removable back platebelow said frame, in combination with an electric circuit having saidframe and back plate as terminals, and actuating drops supported in saidframe at an angle from the vertical but freelytremovable therefrom, saiddrops having notches therein adapted to en age said frame and preventthe drops fa ling out when the back plate is removed; all substantiallyas described.

In testimony whereof I have signed my name to this specification.

GEORGE ADAM URLAUB.

